—adj. 1. pertaining to or occurring in or as if in a tube of fine bore.
2. resembling a strand of hair; hairlike.
3. Physics. a. pertaining to capillarity.
b. of or pertaining to the apparent attraction or repulsion between a liquid and a solid, observed in capillarity.
4. Anat.pertaining to a capillary or capillaries.
—n. 1. Anat.one of the minute blood vessels between the terminations of the arteries and the beginnings of the veins.
2. Also calledcap'illary tube". a tube with a small bore.